2.6.19 crash: one account recovered, one not yet recovered

[Rich Shepard]

   Running GC-2.6.19 on Slackware-14.2 here. I have two accounts, personal
and business.

   This morning I entered three transactions in the personal checking
account, saved each, then tried to open the business file. Gnucash said it
could not find that file, then shut down.

   Reading the gnucash-guide I recovered the personal account by opening
personal.gnucash.20180403092939.gnucash. However, when I looked in the
business directory all I find are log files.

   I last accessed the business account on March 23rd. By habit, I always
save transactions before exiting; in any case, gnucash won't let me exit
without saving unless I explicitly tell it to do so, and I don't.

   Looking at my daily incremental backups I cannot find the last time there
was a business.guncash.*.gnucash file. In my business subdirectory I have
these files:

business.gnucash
business.gnucash.20180323100319.log
business.gnucash.20180323130653.log
business.gnucash.20180323130712.log

   The business.gnucash file is timestamped Mar 23 13:07, as are the latter
two .log files.

   How can I use the binary business.gnucash file to recover the account? If
so, I can bring all registers up to date manually using bank and credit card
statements.

TIA,

Rich